Folks, I apologize at the beginning for the very simple nature of my question buy I've spent two days watching videos, reading Scott Garrigus' book and Cakewalk documentation but I'm still stuck.  I have lots of experience recording live audio with Sonar but I have yet to be able to record using soft synths.
 
I feel like I'm following the directions but have yet to hear a sound when I play my MIDI keyboard.  Here's a screen capture of my current status.  My basic audio path is good because when I play the project, I hear the audio track (Track 1) loud and clear.
 
As you can see from the capture, Sonar is recognizing my MIDI signals as the level meters on Track 3 bounce when I play the keyboard.  But there is no corresponding movement of the meters on Track 2 and no audio is produced.
 

 
Thanks in advance for your patience with my basic problem but it's been kicking my butt and I want to actually be able to create something.
 

What synth are you trying to trigger with MIDI? 

Hey, John.  Thanks for the prompt reply.
 
Dimension Pro.  (Were you able to see my screenshot?)

I cannot see the image. Trying to load the image directly takes me to my Google login page. If I login, access to the image is denied.
 
After adding DimPro to the project, did you select a program from the DimPro browser? DimPro does not load a default sound.

Load TTs-1 as it's a easy one to use. It will default to a piano for all channels and drums for CH 10. 
Open the tts-1 GUI mixer and click on the pre view icons at the bottom of each channel. This will confirm your synth has a output as it plays little snippets of the sound chosen.
If you hear nothing make sure the TTS-1 output is assigned to your master output.  
Make sure the midi track your triggering has it's output assigned to the tts-1 

TCGill
Hey, John.  Thanks for the prompt reply.
 
Dimension Pro.  (Were you able to see my screenshot?)

I could not see your screenshot. Thats because you don't have enough posts to allow you to do that. 
 
Dim Pro is a great synth but be sure you have a sample loaded. Then route your MIDI track that receives your MIDI to the input of Dim Pro.  Play a note and you should hear a sound.
 
BTW welcome to the forum. I like the style of your posts. 
 
Though its a goto synth for trying things out TTS-1 is not a good sounding synth. 

I'll try another way to share my screenshot:  https://www.flickr.com/photos/129172854@N08/15507013217/
 
scook:  When I opened DimPro, I selected an acoustic bass patch.  (If I maximize the DimPro window, the patch (Full Acoustic) is displayed in the "Program Browser" field.
 
johnnyV, I loaded the TTS-1 and, BAM!, I instantly had a track the I could hear!
 
I'm going to add my DimPro track back and compare the settings to try find out what's different.

When just beginning with DimPro try a full range instrument program like a piano or synth. Programs like bass and drums do not cover the entire keyboard range. TTS-1 by default loads a piano so there are fewer surprises with it.

+1, Dimension Pro can have sounds assigned to only certain keys and does not visually show you which are not mapped. For initial routing checks, a piano is best to use to check your setup (all keys will have a sound assigned to them).

Update:  Loading these synths from the Browser work as expected:
TTS-1
Dimension LE
 
But I still get the behavior I originally described when I try to load and use DimPro.
 
I loaded piano and organ patches for both DimLE and DimPro to make sure I wasn't getting a keyboard mapping issue that several of you mentioned.
 
Again, when I try to play the DimPro track, the signal meter on the MIDI track is active but not the associated synth track.  It seems like it should just be a basic routing issue but when I compare the settings for what works and what doesn't, I can't find the difference.
  
Any more ideas?